Improvement in laminated railway-bearing cushions



F. W. SGHROEDER. Laminated Railway Bearing Cushion.

No. 213,841. Patented April 1,1879.

V [U I a g 0 1 B I N-PHERS. PHDTGLITHDGRAPHER. WASHINGTON. D C.

UNITED STATES PATENT OFFICE.

FREDERICK W. SOHROEDER, OF NEW YORK, N. Y., ASSIGNOR OF ONE-HALF HISRIGHT TO ADOLFO HEGEWISOH AND DOMINGO M. MONJO, OF SAME PLACE.

IMPROVEMENT IN LAMINATED Specification forming part of Letters PatentNo. October To all whom it may concern;

Be it known that I, FREDERICK WILLIAM SOHROEDER, of the city, county,and State of New York, have invented a new and useful Improvement inLaminated Railway-Bearing Cushions; and I hereby declare the followingto be a full and clear description of the same.

This invention has for its object the production of a cushion which maybe interposed between the ties and rails of a railway, and also betweenthe various bearings of the trucks of railway rolling-stock, and betweenthe bearings of the cars upon the trucks, for the double purpose ofeasing the shocks or concussions that would naturally arise by reason ofthe train passing over asperities of the track, and reducing the noiseattendant thereon.

These cushions may also be used with very beneficial effect in thebearings between a roadway and a bridge, or other similar elevatedstructure, as well as in avariety of other places that would readilysuggest themselves to an engineer.

The nature of this invention will be fully understood by theaccompanying drawings and the subjoined description.

Figure l of the drawings is a sectional elevation of one of the improvedlaminated cushions. Fig. 2 is a general plan of the same.

This cushion consists of a central sheet, A, of India-rubber, and twocontiguous covering-sheets, B, of wood, cork, felt, leather, or somesimilar elastic material which will protect the india-rubber and keep itfrom vulcanization or other injury, and a covering-envelope, 0, formed,preferably, of canvas.

In constructing these cushions, the rubber sheet A is first prepared ofthe desired size and form, and then the two covering pieces B are madeto coincide in size and contour with the piece A, and are firmlycemented upon its opposite sides with some'suitable water-proofcement-as, for instance, soluble india-rubber cement. These three unitedpieces are then coated with or plunged into a bath of a solution calledwater-glass, or some other similar solution which will thoroughlyprotect the cushion from the oxidating influence to which it would beseverely exposed by reason not only of its being used in the open air,and fre- RAlLWAY-BEARING CUSHIONS.

213,841, dated April 1, 1879; application filed 10, 1878.

quent-ly in close proximity to salt-water, but also by reason of itscontact with iron bearings, the oxide of iron acting to. speedilydestroy the cushion unless it were thus protected.

The water-glass solution above referred to consists of a mixture ofseven parts of silicate of soda and one part of the whites of eggs.

After the three pieces A B B are thoroughly dried, after the coatingabove referred to, the covering-envelope C will be stretched tightlyaround the said pieces A and B, and its ends overlapped and thoroughlycemented together by means of some suitable water-proof cement, and thenthe exterior of this canvas covering will also be coated with somesuitable waterproof solution similar or equal to that above described asand known by the name of wator-glass, or any cement which is imperviousto water.

I am well aware that laminated cushions of various materials have beenheretofore used in England in connection with stone sills or bases, andthat alkaline solutions have been employed to coat and protect fibrouscushions of various formations from atmospheric injury; also, thatcork-cuttings, and wood, and indiarubber have been used for theconstruction of cushions of various forms; but to none of these featuresdo I lay any claim in the forms in which they have been commonly orparticularly used.

The coating which I have described as wa ter-glass is especially bestadapted to the coating of these cushion when they are to be used injournal-boxes, for the reason that it is a nonconductor of heat, andcannot, consequently, act as a transmitter of heat from a hot axle.

Having described my invention, I claim- The laminated cushion A B B,formed of a central sheet, A, of india-rubber, with two contiguouselastic pieces, B B, firmly cemented, respectively, upon its oppositesides, the whole covered with an envelope, 0, and coated with aprotecting solution, substantially as and for the purpose set forth.

FREDERICK WILLIAM SCHROEDER.

Witnesses:

M. RANDOLPH, ABNER O. THOMAS.

